Demolding device for plastic product injection mold

Abstract

The invention discloses a demolding device for a plastic product injection mold, and relates to the technical field of injection molds, the demolding device comprises a movable mold, a fixed mold, a mounting plate, a mold closing cylinder, a mounting rack, a mold core and a demolding unit; the mounting plate is fixed on the injection molding machine and is used for mounting and fixing other components; the mold closing cylinder is fixed on the mounting plate and is used for driving the moving mold to move and realizing opening and closing of the mold; the mounting frame is fixed at the end part of a piston rod of the mold closing cylinder, and guide rods are fixed at four corners of the mounting frame, penetrate through the mounting plate and are fixedly connected with the movable mold; the mold core is arranged in the cavity of the movable mold, and the middle of the mold core is of a conical structure and used for molding the shape of an injection product; the demolding unit is provided with shovel plates which are arranged in the circumferential direction, located on the outer side of the mold core and used for demolding injection-molded products; the technical effects that the pressure distribution is uniform, the risk of scratching or extruding the surface of a product is reduced, the demolding efficiency is improved, the stability is improved, and the production efficiency is improved can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and in particular to a demoulding device for an injection mold of a plastic product. Background Art

[0002] Injection molds are molds used for plastic injection molding production. They are used to inject molten plastic material into the mold cavity and form the required plastic products after cooling and solidification. The demoulding device of the plastic product injection mold is mainly used to safely and efficiently remove the product from the mold after the plastic product is injection molded. The demoulding of the product directly affects the quality of the product after molding and the overall production efficiency.

[0003] For the demoulding of plastic products, a Chinese invention patent with a publication number of CN118144214B discloses a mobile phone case injection mold that is easy to demould, including a movable mold, a fixed mold, a mounting plate and a demoulding device, a mold-closing cylinder is fixed on one side of the mounting plate, a mounting frame is fixed on the piston rod end of the mold-closing cylinder, and guide rods are fixed on the four corners of the mounting frame, one end of the guide rod passes through the mounting plate and is fixedly connected to the movable mold, and the guide rod is slidably connected to the mounting plate, a sliding rod is slidably connected to the center of the movable mold, one end of the sliding rod is fixed with a mold core, a cavity is provided at the movable mold and the fixed mold facing the mold core, and the mold core is arranged in the mold cavity of the movable mold, and a sliding sleeve is slidably connected to the end of the sliding rod away from the mold core; the invention greatly reduces the need for manual intervention through an automated demoulding device, speeds up the production cycle, makes the demoulding process fast and accurate, and enables the mobile phone case after injection molding to be quickly ejected from the mold to prepare for the next round of injection molding.

[0004] Although the above scheme improves the working efficiency to a certain extent when demolding plastic products, in actual use, due to the small contact area between the hook structure of the original demolding hook and the mobile phone case when demolding the injection-molded mobile phone case, the pressure during demolding cannot be effectively dispersed and act on the product surface, which may cause deformation or damage to the product due to excessive local pressure, increase the risk of scratching or extrusion on the product surface during the demolding process, reduce the demolding efficiency and product quality, and cannot guarantee the stability of the product during demolding, affecting the production efficiency. Summary of the invention

[0005] The present application solves the technical problems in the prior art of uneven pressure distribution, increased risk of scratches or extrusion on the product surface, low demoulding efficiency, poor stability and affected production efficiency by providing a demoulding device for a plastic product injection mold. The application achieves the technical effects of uniform pressure distribution, reduced risk of scratches or extrusion on the product surface, improved demoulding efficiency, improved stability and improved production efficiency.

[0006] The present application provides a demoulding device for a plastic product injection mold, comprising a movable mold, a fixed mold, a mounting plate, a mold clamping cylinder, a mounting frame, a mold core and a demoulding unit;

[0007] The mounting plate is fixed on the injection molding machine and is used to install and fix other components; the clamping cylinder is fixed on the mounting plate and is used to drive the movement of the movable mold and realize the opening and closing of the mold; the mounting frame is fixed to the end of the piston rod of the clamping cylinder and guide rods are fixed at its four corners, and the guide rods pass through the mounting plate and are fixedly connected to the movable mold; the mold core is arranged in the mold cavity of the movable mold and has a conical structure in the middle, which is used to shape the injection molded product;

[0008] The demoulding unit has a circumferentially arranged scraper plate, which is located outside the mold core and is used for demoulding the injection molded product.

[0009] Furthermore, the demoulding unit is used to realize rapid demoulding of the product, and includes a connecting plate, a driving plate, and a sliding sleeve rod;

[0010] There are two connecting plates, which are arranged in a mirror image and fixed on the movable mold; there are four driving plates, and each group of driving plates includes two driving plates, which are respectively slidably connected to the connecting plates and the inside of the movable mold; the sliding sleeve rod slides inside the movable mold and is located in the middle of the movable mold, and is used to drive the mold core to move in the cavity.

[0011] Furthermore, one end of the sliding rod is connected to the mold core, and the other end is connected to the limit plate; a limit plate is fixed on the sliding rod, a third spring is sleeved on the outer side of the sliding rod between the movable mold and the limit plate, and a second spring is sleeved on the outer side of the sliding rod between the sliding rod and the limit plate; the end of the sliding rod cooperates with the mounting plate, and the end of the limit plate cooperates with the movable mold.

[0012] Furthermore, the driving plate is an L-shaped structure and its vertical section is slidably connected to a limit rod through a first spring, and a contact ball is fixed to one end of the limit rod close to the movable mold, and the contact ball is an elastic ball, which is used to contact the movable mold during the demoulding process to play a limiting role;

[0013] The horizontal section of the driving plate is connected to a shovel plate in an articulated manner. The shovel plate is an arc-shaped structure and one end close to the product is a pointed structure, which is used to directly contact and scoop up the injection molded product to achieve demoulding.

[0014] Furthermore, four airbags are fixed on the outer side of the middle part of the mold core. The airbags are spliced ​​to form a square structure. The longitudinal cross-section of the airbag in a fully expanded state is a semicircular structure, which is used to provide a guiding effect for the shovel plate.

[0015] Furthermore, the airbag is made of a flexible rubber material and has a plurality of air outlets evenly arranged at the top and an air inlet arranged at the bottom.

[0016] Furthermore, an air pump is fixed at the bottom of the movable mold, and the air pump is connected to the air inlet on the airbag through a pipeline to provide gas power for the airbag.

[0017] Furthermore, the gas outputted from the air pump is cold air, which is used to cool the formed product by blowing.

[0018] Furthermore, a plurality of blocking blocks are arranged inside the airbag, the blocking blocks correspond to the air outlets one by one, the blocking blocks are connected to the inner wall of the airbag by a hinged manner, and the blocking blocks are made of magnetic material.

[0019] Furthermore, a plurality of magnetic balls are evenly connected to the bottom of the shovel plate in an articulated manner, and the magnetic properties of the magnetic balls are opposite to those of the blocking blocks.

[0020] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0021] By optimizing the demoulding structure and adopting a shovel plate structure, the contact area between the demoulding structure and the product is increased, so that the pressure acting on the product can be effectively dispersed and act on the product surface, reducing the risk of product deformation or damage, and enhancing the stability of the product during demoulding. The technical problems in the prior art such as uneven pressure distribution, increased risk of scratches or extrusion on the product surface, low demoulding efficiency, poor stability and affected production efficiency are effectively solved, and the technical effects of uniform pressure distribution, reduced risk of scratches or extrusion on the product surface, improved demoulding efficiency, improved stability and improved production efficiency are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic diagram of the overall three-dimensional structure of a demoulding device for a plastic product injection mold.

[0023] Figure 2 The present invention is a schematic diagram of a partial three-dimensional structure of a demoulding device for a plastic product injection mold.

[0024] Figure 3 The present invention is a schematic diagram of an inverted three-dimensional structure of a demoulding unit of a demoulding device for a plastic product injection mold.

[0025] Figure 4 The present invention is a schematic diagram of the three-dimensional structure of a sliding sleeve rod of a demoulding device for a plastic product injection mold.

[0026] Figure 5 The present invention is a full cross-sectional view of a mold core and an air bag of a demoulding device for a plastic product injection mold.

[0027] Figure 6 The present invention is a schematic diagram of the state of a scraper plate of a demoulding device for a plastic product injection mold before demoulding.

[0028] Figure 7 This is a partial enlarged schematic diagram of point A of a demoulding device for a plastic product injection mold of the present invention.

[0029] Figure 8 The present invention is a schematic diagram of the state of a scraper plate of a demoulding device for a plastic product injection mold during demoulding.

[0030] Fig. 9 This is a partial enlarged schematic diagram of position B of a demoulding device for a plastic product injection mold of the present invention.

[0031] In the figure: 100, movable mold; 110, fixed mold; 120, mounting plate; 130, mold clamping cylinder; 140, mounting frame; 150, guide rod; 160, mold core; 170, air bag; 171, air inlet; 172, air outlet; 173, blocking block; 180, air pump; 200, demoulding unit; 210, connecting plate; 220, driving plate; 221, limiting rod; 222, first spring; 223, contact ball; 224, shovel plate; 225, magnetic ball; 230, sliding rod; 231, second spring; 232, limiting plate; 233, third spring; 234, sliding rod. DETAILED DESCRIPTION

[0032] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0033] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] See also Figure 1, which is a schematic diagram of the overall three-dimensional structure of a demoulding device for a plastic product injection mold of the present invention; the demoulding device for a plastic product injection mold of the present application optimizes the demoulding structure, changes the demoulding hook structure into a shovel plate structure, and increases the contact area between the demoulding structure and the product, so that the pressure acting on the product during demoulding can be more effectively dispersed and act on the product surface, reducing the risk of product deformation or damage, enhancing the stability of the product during demoulding, and achieving the technical effects of uniform pressure distribution, reducing the risk of scratches or extrusion on the product surface, improving demoulding efficiency, improving stability and improving production efficiency.

[0036] Embodiment 1: Figure 1-Figure 3 As shown, the present application is a demoulding device for a plastic product injection mold, characterized in that it includes a movable mold 100, a fixed mold 110, a mounting plate 120, a mold clamping cylinder 130, a mounting frame 140, a mold core 160 and a demoulding unit 200;

[0037] The mounting plate 120 is fixed on the injection molding machine and is used to install and fix other components;

[0038] The mold clamping cylinder 130 is fixed on the mounting plate 120 and is used to drive the movable mold 100 to move and realize the opening and closing of the mold;

[0039] The mounting frame 140 is fixed to the end of the piston rod of the mold clamping cylinder 130 and the four corners thereof are fixed with guide rods 150, the guide rods 150 pass through the mounting plate 120 and are fixedly connected to the movable mold 100;

[0040] The mold core 160 is disposed in the mold cavity of the movable mold 100 and has a conical structure in the middle, and is used to shape the injection molded product;

[0041] The demoulding unit 200 has a circumferentially arranged scraper plate 224, which is located outside the mold core 160 and is used to demould the injection molded product.

[0042] The demoulding unit 200 is used to realize rapid demoulding of the product, and includes a connecting plate 210, a driving plate 220, and a sliding rod 230;

[0043] The connecting plates 210 are provided with two, arranged in mirror image and both fixed on the movable mold 100;

[0044] There are four drive plates 220, and each set of drive plates 220 includes two drive plates 220, which are slidably connected to the connecting plate 210 and the inside of the movable mold 100 respectively;

[0045] The sliding rod 230 slides inside the movable mold 100 and is located in the middle of the movable mold 100, and is used to drive the mold core 160 to move in the mold cavity.

[0046] A sliding rod 234 is slidably connected above the sliding rod 230, one end of the sliding rod 234 is connected to the mold core 160, and the other end is connected to the limit plate 232; the limit plate 232 is fixed on the sliding rod 234, and a third spring 233 is sleeved on the outer side of the sliding rod 234, which is located between the movable mold 100 and the limit plate 232, and a second spring 231 is sleeved on the outer side of the sliding rod 234, which is located between the sliding rod 230 and the limit plate 232; the end of the sliding rod 230 cooperates with the mounting plate 120, and the end of the limit plate 232 cooperates with the movable mold 100.

[0047] The driving plate 220 is an L-shaped structure, and its vertical section is slidably connected to a limiting rod 221 through a first spring 222. A contact ball 223 is fixed to one end of the limiting rod 221 close to the movable mold 100. The contact ball 223 is an elastic ball, which is used to contact the movable mold 100 during the demoulding process to play a limiting role.

[0048] The horizontal section of the driving plate 220 is connected to a shovel plate 224 in a hinged manner. The shovel plate 224 is an arc-shaped structure and one end close to the product is a pointed structure, which is used to directly contact and scoop up the injection molded product to achieve demoulding.

[0049] The present application adopts a shovel plate 224 with a shovel structure and combines it with the design of a conical mold core 160, which not only increases the contact area with the product during demolding, but also enables the demolding force to be evenly distributed, reduces the risk of product deformation or damage, enhances the stability of the product during demolding, ensures the smooth progress of the production process, and thus improves the demolding efficiency and product quality.

[0050] When the embodiment of the present application is actually running, the steps are as follows:

[0051] Step 1: After the injection molding is completed, the mold closing cylinder 130 starts to work, and drives the movable mold 100 to move downward through the mounting frame 140 and the guide rod 150, and the distance between the mounting plate 120 and the movable mold 100 gradually decreases, thereby realizing the mold opening operation;

[0052] Step 2: When the mounting plate 120 contacts the end of the sliding rod 230 , the second spring 231 and the third spring 233 are squeezed, and the sliding rod 234 drives the mold core 160 to move smoothly out of the cavity of the movable mold 100 ;

[0053] Step 3: As the mounting plate 120 continues to approach the movable mold 100, the mounting plate 120 contacts the driving plate 220 and compresses the first spring 222. As the driving plate 220 moves in the guide groove on the connecting plate 210, the driving plate 220 begins to move along the inclined portion of the guide groove.

[0054] Step 4: When the driving plate 220 moves to the connection between the inclined portion and the vertical portion of the guide groove, the shovel plate 224 moves smoothly along the inclined surface structure in the middle of the mold core 160 and clings to the edge of the injection molded part of the mobile phone case, and then demoulding is performed;

[0055] Step 5: As the distance between the mounting plate 120 and the movable mold 100 continues to decrease, when the driving plate 220 is completely moved into the vertical portion of the guide groove, the shovel plate 224 shovels and removes the mobile phone case injection molded part from the mold core 160. At this time, the injection molded product maintains its complete shape due to uniform force and there is no obvious damage on the surface. Finally, through the contraction of the clamping cylinder 130, the movable mold 100 and the fixed mold 110 are re-closed, and the various components of the mold are reset to prepare for the next injection cycle.

[0056] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0057] The invention solves the technical problems in the prior art of uneven pressure distribution, increased risk of scratching or extrusion on the product surface, low demoulding efficiency, poor stability and affected production efficiency, and achieves the technical effects of uniform pressure distribution, reduced risk of scratching or extrusion on the product surface, improved demoulding efficiency, improved stability and improved production efficiency.

[0058] Embodiment 2: In order to further improve the demoulding effect of the shovel plate 224 on the product and improve the smoothness of the demoulding process, while avoiding the jamming phenomenon, the present application proposes the following technical solutions for the above technical problems, specifically:

[0059] like Figure 4 and Figure 5 As shown, four airbags 170 are fixed to the outer side of the middle part of the mold core 160 . The airbags 170 are spliced ​​to form a square structure. The longitudinal cross-section of the airbags 170 in a fully expanded state is a semicircular structure, which is used to provide a guiding effect for the shovel plate 224 .

[0060] In this embodiment, a plurality of air bags 170 are arranged outside the middle structure of the mold core 160. The guiding effect of the air bags 170 enables the shovel plate 224 to move more smoothly during the demolding process, effectively improving the smoothness of the demolding process and avoiding the jamming phenomenon that may occur in the traditional demolding method. At the same time, the guiding effect of the air bags 170 enables the shovel plate 224 to be demolded more accurately along the tapered structure of the mold core 160, improving the demolding efficiency and product quality and avoiding product damage. In addition, the cooling effect of the cold air provided by the air pump 180 further protects the shape and performance of the injection molded product from being affected by heat, and realizes an efficient and non-destructive demolding process.

[0061] Embodiment 3: Considering that after the injection molding is completed, the molded product is subjected to high heat during the demolding process. The product may be heated to the point where its performance and shape are unstable during the demolding process by the shovel plate 224. Therefore, the product may be deformed and damaged during the demolding process due to the action of the shovel plate 224. In order to avoid damage to the product and improve the quality of the molded product, the present application proposes the following technical solutions for the above technical problems, which are as follows:

[0062] like Figure 4-Figure 7 As shown, the airbag 170 is made of a flexible rubber material and has a plurality of air outlets 172 evenly arranged at the top and an air inlet 171 arranged at the bottom.

[0063] An air pump 180 is fixed at the bottom of the movable mold 100 . The air pump 180 is connected to an air inlet 171 on the air bag 170 through a pipeline to provide gas power for the air bag 170 .

[0064] The gas outputted from the air pump 180 is cold air, which is used to cool the formed product by blowing.

[0065] This embodiment adds an air pump 180 and an air bag 170 and utilizes cold air to cool the injection molded product, thereby effectively solving the problem that the injection molded product is easily deformed at high temperatures and improving demolding efficiency and product quality. The rapid cooling effect of the cold air enables the injection molded product to be quickly shaped and reduces the shape instability caused by heat. The automated demolding process reduces the need for manual intervention, speeds up the production cycle, and reduces the risk of work-related accidents.

[0066] Embodiment 4: In order to make the product easier and more convenient to separate from the mold, while reducing the manufacturing cost and maintenance difficulty, the present application proposes the following technical solutions for the above technical problems, specifically:

[0067] like Figure 6-Figure 9 As shown, a plurality of blocking blocks 173 are disposed inside the airbag 170 , and the blocking blocks 173 correspond to the air outlets 172 one by one. The blocking blocks 173 are connected to the inner wall of the airbag 170 by hinged connection, and the blocking blocks 173 are made of magnetic material.

[0068] The bottom of the shovel plate 224 is evenly connected with a plurality of magnetic balls 225 in a hinged manner, and the magnetic properties of the magnetic balls 225 and the blocking block 173 are opposite.

[0069] Before demolding, the airbag 170 is in a dynamic synchronous inflation and deflation state; when the shovel plate 224 starts to demold the product, the shovel plate 224 moves upward along the mold core 160 to squeeze the airbag 170, and the magnetic ball 225 moves on the airbag 170 with the shovel plate 224. The magnetic ball 225 cooperates with the blocking block 173. In the process of squeezing the airbag 170, the blocking block 173 moves to the corresponding air outlet 172 and blocks the corresponding air outlet 172. At this time, the airbag 170 is in a state of expansion by filling with cold air, which is convenient for demolding; after demolding, the shovel plate 224 moves upward until it is no longer in contact with the airbag 170, the magnetic ball 225 cooperates with the blocking block 173, and the blocking block 173 is removed from the air outlet 172. At this time, the airbag 170 is in a dynamic synchronous inflation and deflation state.

[0070] The present application realizes the automatic opening and closing of the air outlet 172 through magnetic interaction, simplifies the equipment structure and reduces the cost. The cooperation between the magnetic blocking block 173 and the magnetic ball 225 is a non-contact connection method, which reduces mechanical wear and failure rate. At the same time, the magnetic control mechanism has strong adaptability to the environment and is not easily affected by external factors such as temperature and humidity, thereby improving the reliability and durability of the mold.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A demoulding device for a plastic product injection mold, characterized in that: It comprises a movable mold (100), a fixed mold (110), a mounting plate (120), a mold clamping cylinder (130), a mounting frame (140), a mold core (160) and a demoulding unit (200); The mounting plate (120) is fixed on the injection molding machine and is used to install and fix other components; the mold clamping cylinder (130) is fixed on the mounting plate (120) and is used to drive the movement of the movable mold (100) and realize the opening and closing of the mold; the mounting frame (140) is fixed to the end of the piston rod of the mold clamping cylinder (130) and has guide rods (150) fixed at its four corners, and the guide rods (150) pass through the mounting plate (120) and are fixedly connected to the movable mold (100); the mold core (160) is arranged in the mold cavity of the movable mold (100) and has a conical structure in the middle, and is used to shape the injection molded product; The demoulding unit (200) is provided with a circumferentially arranged scraper plate (224), which is located outside the mold core (160) and is used for demoulding the injection molded product.

2. A demoulding device for a plastic product injection mold according to claim 1, characterized in that: The demoulding unit (200) is used to realize rapid demoulding of the product, and comprises a connecting plate (210), a driving plate (220), and a sliding sleeve rod (230); The connecting plates (210) are provided with two, arranged in a mirror image and both fixed on the movable mold (100); the driving plates (220) are provided with four, and each group of driving plates (220) includes two driving plates (220), which are respectively slidably connected to the connecting plates (210) and the inside of the movable mold (100); the sliding rod (230) slides inside the movable mold (100) and is located in the middle of the movable mold (100), and is used to drive the mold core (160) to move in the mold cavity.

3. A demoulding device for a plastic product injection mold according to claim 2, characterized in that: A sliding rod (234) is slidably connected above the sliding rod (230), one end of the sliding rod (234) is connected to the mold core (160), and the other end is connected to the limit plate (232); the limit plate (232) is fixed on the sliding rod (234), the outer side of the sliding rod (234) is located between the movable mold (100) and the limit plate (232) and is sleeved with a third spring (233), and the outer side of the sliding rod (234) is located between the sliding rod (230) and the limit plate (232) and is sleeved with a second spring (231); the end of the sliding rod (230) is matched with the mounting plate (120), and the end of the limit plate (232) is matched with the movable mold (100).

4. A demoulding device for a plastic product injection mold as claimed in claim 3, characterized in that: The driving plate (220) is an L-shaped structure, and its vertical section is slidably connected to a limiting rod (221) via a first spring (222); a contact ball (223) is fixed to one end of the limiting rod (221) close to the movable mold (100); the contact ball (223) is an elastic ball, and is used to contact the movable mold (100) during the demoulding process to play a limiting role; The horizontal section of the driving plate (220) is connected to a shovel plate (224) in an articulated manner. The shovel plate (224) is an arc-shaped structure and one end close to the product is a pointed structure, which is used to directly contact and scoop up the injection molded product to achieve demoulding.

5. A demoulding device for a plastic product injection mold as claimed in claim 4, characterized in that: Four airbags (170) are fixed to the outer side of the middle of the mold core (160). The airbags (170) are spliced ​​to form a square structure. The longitudinal cross-section of the airbags (170) in a fully expanded state is a semicircular structure, which is used to provide a guiding effect for the shovel plate (224).

6. A demoulding device for a plastic product injection mold as claimed in claim 5, characterized in that: The airbag (170) is made of a flexible rubber material and has a plurality of air outlets (172) evenly arranged at its top end and an air inlet (171) arranged at its bottom end.

7. A demoulding device for a plastic product injection mold according to claim 6, characterized in that: An air pump (180) is fixed at the bottom of the movable mold (100), and the air pump (180) is connected to the air inlet (171) on the air bag (170) through a pipeline, so as to provide gas power for the air bag (170).

8. A demoulding device for a plastic product injection mold according to claim 7, characterized in that: The gas outputted from the air pump (180) is cold air, which is used to cool the formed product by blowing.

9. A demoulding device for a plastic product injection mold according to claim 8, characterized in that: A plurality of blocking blocks (173) are arranged inside the airbag (170), the blocking blocks (173) correspond one to one with the air outlets (172), the blocking blocks (173) are connected to the inner wall of the airbag (170) by hinged connection, and the blocking blocks (173) are made of magnetic material.

10. A demoulding device for a plastic product injection mold according to claim 9, characterized in that: The bottom of the shovel plate (224) is evenly connected with a plurality of magnetic balls (225) in an articulated manner, and the magnetic properties of the magnetic balls (225) are opposite to those of the blocking block (173).

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